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Molecular sieve type: what is the difference between 3A, 4A, 5A molecular sieve?

At present, the industry uses the prefix number to distinguish the molecular sieve with different crystal structures, such as 3A, 4A, 5A molecular sieve. So what is the difference between 3a, 4a, 5a molecular sieve? Are these 3 types of molecular sieves used in the same way? What are the working principles? Truemei unified answer.

The chemical formula of 3a, 4a, 5a molecular sieve is as follows:

3A molecular sieve chemical formula: 2/3K₂O1₃-Na₂₂O-Al₂O₃-2SiO₂. -4.5H₂O

4A molecular sieve chemical formula: Na₂O-Al₂O₃-2SiO₂ -4.5H₂O

5A molecular sieve chemical formula: 3/4CaO1/4Na₂OAl₂O₃-2SiO₂-4.5H₂O

3a, 4a, 5a molecular sieves have different pore sizes

The working principle of molecular sieve is mainly related to the pore size of molecular sieve, which is 0.3nm/0.4nm/0.5nm respectively, they can adsorb gas molecules whose molecular diameter is smaller than the pore size. Therefore, the larger the size of the pore size, the larger the adsorption capacity. Pore size is different, the filtration and separation of things are also different. Take the 3a molecular sieve produced by Truemei as an example, it can only adsorb molecules lower than 0.3nm, and cannot adsorb those beyond 0.3nm. When the molecular sieve is used as a desiccant, a molecular sieve can adsorb up to 22% of its own weight of water, which is the origin of the molecular sieve water removal principle.

3a, 4a, 5a molecular sieve application industry is different

3A molecular sieve is mainly used in insulating glass, petroleum, chemical, pharmaceutical and other industries. 4A molecular sieve is mainly used in natural gas, refrigerant, pharmaceutical and other industries. 5A molecular sieve is mainly used in natural gas desulfurization, preparation of oxygen, oil dewaxing and other specific applications.

Regardless of the type of molecular sieve, its application in the industry is mainly drying and dehydration.

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